INGREDIENTS
8 oz
bittersweet or semisweet baking chocolate, finely chopped
2/3 cup
unsweetened cocoa powder, (measured correctly)
2 tsp
instant espresso powder
1 cup
boiling water
1 3/4
cups all-purpose flour, (measured correctly)
3/4 cup
granulated sugar
3/4 cup
packed light brown sugar
1 tsp
salt
1 tsp
baking soda
1 cup
buttermilk, at room temperature
1/2 cup
plus 2 tablespoons vegetable oil or coconut oil
3
large eggs plus one egg yolk, at room temperature
2 tsp
vanilla extract
4 oz
semisweet baking chocolate, chopped
6 tbsp
unsalted butter
2 cups
powdered sugar, sifted
2 tbsp
unsweetened cocoa powder, sifted
1/2 cup
milk
Sprinkles, if desired